add every

docs/lib3x-every.md

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+# every
+
+The `every` function tests whether all elements in the list pass the test implemented by the provided function. 
+
+**Since:** 3.0
+
+## Parameters
+
+- `lt` : the list.
+- `test` : a test function that accepts an element and returns `true` or `false`.
+
+## Examples
+
+    use <util/every.scad>;
+   
+    biggerThanZero = function(elem) elem > 0;
+    assert(every([1, 30, 39, 29, 10, 13], biggerThanZero));